Call it sympathy weather, a cold spell bearing down on Northern California this week as other parts of the country dig out from two feet of early-season snow.

The Bay Area enjoyed a sunny and warm Halloween as snowed-in New England towns canceled trick-or-treating or pushed the holiday forward a week.

Now, it’s our turn to shiver, in a California kind of way: Nothing like a nor’easter, but a chance of showers and a hint of frost.

“These will be the first cold days of the season,” said meteorologist Steve Anderson of the National Weather Service. “We have some cold air coming down from the Alaska region and Canada later on this week.”

In other words, it’s time to pick those tomatoes before they get squishy.

Cold air will arrive by Thursday night, pushing parts of Sonoma and Napa counties toward freezing. By Friday night, the frost is likely to be more widespread.

Inland valley areas are the most likely to get frosted, including Livermore, Concord, the North Bay wine country and the Salinas Valley, Anderson said.

The Bay Area had early rains the first week of October, and there is a 40 percent chance of more rain Thursday. Snow could land at elevations higher than 3,000 feet.

Before the rain, however, watch out for the wind. The service warns of a high fire danger in the East Bay and North Bay hills. Warm, dry and strong winds — with gusts reaching 25 to 35 miles per hour — will blow from the interior toward the coast for much of Tuesday.

The fire warning will be in effect from 6 a.m. Tuesday until 6 a.m. Wednesday. The National Park Service has banned all fires, as well as smoking, at the Marin Headlands, Muir Woods and the Point Reyes National Seashore. The East Bay Regional Park District has also banned campfires outside of day-use picnic sites.

Violent police encounters in California last year led to the deaths of 157 people and six officers, the state attorney general’s office said Thursday in a report that provides the first statewide tally on police use-of-force incidents.

At 6:03 p.m. Wednesday, police responded to reports of the robbery at the facility, 2301 Bancroft way, and learned that a man who snuck into the facility and began prowling through the building, taking cell phones and wallets from victims.

Investigators’ efforts to solve the case led to the arrests of Pablo Mendoza, 25, of Hayward, Brandon Follings, 26, of Oakland and Valeria Boden, 26, of Alameda, the Alameda County Sheriff’s Office said Thursday.